Lithium Ion Battery

Abstract

A high-input and high-output battery having a large capacity while guaranteeing safety is provided. As a composition of an electrolytic solution, a composition ratio of ethylene carbonate (EC) is 20 vol % or more and 30 vol % or less, and a composition ratio of dimethyl carbonate (DMC) is 36 vol % or more and 50 vol % or less, and a composition ratio η (DMC/EMC) of dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) is 1.05≦η≦1.7. Furthermore, a composition ratio of an additive is 0.1 wt. % or more and 1.0 wt. % or less, and a concentration of lithium salt is 1.0 mol/L or more and 1.5 mol/L or less.

1 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container, a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,
 wherein the positive electrode has a current collector and a positive electrode composite applied to both surfaces of the current collector,   the positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide and spinel lithium manganese oxide,   a density of the positive electrode composite is 2.4 g/cm 3  or more and 2.7 g/cm 3  or less, and an application quantity of the positive electrode composite is 175 g/m 2  or more and 250 g/m 2  or less, and   the discharge capacity X and a weight ratio Y obtained by taking the layered lithium nickel manganese cobalt composite oxide as a numerator and the spinel lithium manganese oxide as a denominator satisfy a following relational expression 1:
     Y<− 0.0062 X+ 1.05(30 ≦X< 100)  (relational expression 1),
 
   the electrolytic solution contains a solvent, an additive and lithium salt,   the solvent contains ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate,   the additive is a compound containing at least one of elements selected from oxygen, boron, sulfur and fluorine within its molecule,   the lithium salt includes at least one of compounds selected from LiPF 6 , LiBF 4 , LiN(FSO 2 ) 2  and LiN(CF 3 SO 2 ) 2 ,   a composition ratio of the ethylene carbonate is 20 vol % or more and 30 vol % or less,   a composition ratio of the dimethyl carbonate is 36 vol % or more and 50 vol % or less,   a composition ratio η of the dimethyl carbonate and the ethyl methyl carbonate (dimethyl carbonate/ethyl methyl carbonate) is 1.0≦η≦1.7,   a composition ratio of the additive is 0.1 wt. % or more and 1.0 wt. % or less, and   a concentration of the lithium salt is 1.0 mol/L or more and 1.5 mol/L or less.   
     
     
         2 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container, a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,
 wherein the positive electrode has a current collector and a positive electrode composite applied to both surfaces of the current collector,   the positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide and spinel lithium manganese oxide,   a density of the positive electrode composite is 2.4 g/cm 3  or more and 2.7 g/cm 3  or less, and an application quantity of the positive electrode composite is 175 g/m 2  or more and 250 g/m 2  or less, and a weight ratio of the layered lithium nickel manganese cobalt composite oxide and the spinel type lithium manganese oxide (layered lithium nickel manganese cobalt composite oxide/spinel type lithium manganese oxide) is 10/90 or more and 60/40 or less,   the electrolytic solution contains a solvent, an additive and lithium salt,   the solvent contains ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate,   the additive is a compound containing at least one of elements selected from oxygen, boron, sulfur and fluorine within its molecule,   the lithium salt includes at least one of compounds selected from LiPF 6 , LiBF 4 , LiN(FSO 2 ) 2  and LiN(CF 3 SO 2 ) 2 ,   a composition ratio of the ethylene carbonate is 20 vol % or more and 30 vol % or less,   a composition ratio of the dimethyl carbonate is 36 vol % or more and 50 vol % or less,   a composition ratio η of the dimethyl carbonate and the ethyl methyl carbonate (dimethyl carbonate/ethyl methyl carbonate) is 1.0≦η≦1.7,   a composition ratio of the additive is 0.1 wt. % or more and 1.0 wt. % or less, and   a concentration of the lithium salt is 1.0 mol/L or more and 1.5 mol/L or less.   
     
     
         3 . The lithium ion battery according to  claim 1 ,
 wherein the additive contains at least one compound selected from vinylene carbonate, 1,3-propene sultone, fluoroethylene carbonate, diphenyl sulfide and LiBOB.   
     
     
         4 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container,
 a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,   wherein, in the negative electrode, a negative electrode composite containing carbon is applied to both sides of a current collector,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less,   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less,   the electrolytic solution contains an additive including at least one of 1,3-propene sultone and fluoroethylene carbonate, and   the additive is contained in the electrolytic solution at 0.1 wt. % or more and less than 10 wt. %.   
     
     
         5 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container,
 a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,   wherein, in the negative electrode, a negative electrode composite containing carbon is applied to both sides of a current collector,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less,   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less,   the electrolytic solution contains an additive including 1,3-propene sultone and fluoroethylene carbonate, and   the additive is contained in the electrolytic solution at 0.2 wt. % or more and 10 wt. % or less.   
     
     
         6 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container,
 a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,   wherein, in the negative electrode, a negative electrode composite containing carbon is applied to both sides of a current collector,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less,   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less,   the electrolytic solution contains an additive including 1,3-propene sultone, and   the 1,3-propene sultone is contained in the electrolytic solution at 0.5 wt. % or more and 2 wt. % or less.   
     
     
         7 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container,
 a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,   wherein, in the negative electrode, a negative electrode composite containing carbon is applied to both sides of a current collector,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less,   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less,   the electrolytic solution contains an additive including fluoroethylene carbonate, and   the fluoroethylene carbonate is contained in the electrolytic solution at 0.5 wt. % or more and 2 wt. % or less.   
     
     
         8 . The lithium ion battery according to  claim 4 ,
 wherein the negative electrode composite contains non-crystalline carbon,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 1.5 g/cm 3  or less, and   an application quantity of the negative electrode composite is 50 g/m 2  or more and 100 g/m 2  or less.   
     
     
         9 . The lithium ion battery according to  claim 4 ,
 wherein the negative electrode composite includes graphite carbon,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less, and   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less.   
     
     
         10 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container,
 a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,   wherein, in the negative electrode, a negative electrode composite containing carbon is applied to both sides of a current collector,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less,   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less,   the electrolytic solution contains an additive including at least one of diphenyl sulfide and LiBOB, and   the additive is contained in the electrolytic solution at 0.1 wt. % or more and less than 10 wt. %.   
     
     
         11 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container,
 a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,   wherein, in the negative electrode, a negative electrode composite containing carbon is applied to both sides of a current collector,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less,   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less,   the electrolytic solution contains an additive including diphenyl sulfide and LiBOB, and   the additive is contained in the electrolytic solution at 0.2 wt. % or more 10 wt. % or less.   
     
     
         12 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container,
 a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,   wherein, in the negative electrode, a negative electrode composite containing carbon is applied to both sides of a current collector,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less,   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less,   the electrolytic solution contains an additive including diphenyl sulfide, and   the diphenyl sulfide is contained in the electrolytic solution at 0.5 wt. % or more and 3 wt. % or less.   
     
     
         13 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container,
 a discharge capacity X of the battery being 30 Ah or more and less than 100 Ah,   wherein, in the negative electrode, a negative electrode composite containing carbon is applied to both sides of a current collector,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less,   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less,   the electrolytic solution contains an additive including LiBOB, and   the LiBOB is contained in the electrolytic solution at 0.5 wt. % or more and 3 wt. % or less.   
     
     
         14 . The lithium ion battery according to  claim 10 ,
 wherein the negative electrode composite contains non-crystalline carbon,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 1.5 g/cm 3  or less, and   an application quantity of the negative electrode composite is 50 g/m 2  or more and 100 g/m 2  or less.   
     
     
         15 . The lithium ion battery according to  claim 10 ,
 wherein the negative electrode composite contains graphite carbon,   a density of the negative electrode composite is 0.7 g/cm 3  or more and 2.0 g/cm 3  or less, and   an application quantity of the negative electrode composite is 40 g/m 2  or more and 100 g/m 2  or less.   
     
     
         16 . A lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container,
 the lithium ion battery having a discharge capacity of 30 Ah or more and less than 100 Ah,   the electrolytic solution contains diphenyl sulfide.